Sounds like the torque converter has seen better days.I recommend taking the vehicle to a Transmission repair shop, preferable a shop that employes ASE Technicians. This way you can get the transmission repaired and sputtering mystery solved at the same place.

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Related Questions:

I have a 2008 Impala and The dealer had to rebuild my Automatic Transmission and the Car only has 80,000 miles on it. I have never had an automic transmission go out on me, I have had cars close to 200,000 miles and never had this problem.

check compression on each cylinder and fuel pressure,I dont know if you have the tools,but for that engine whit 200,000 miles,I think the compression is down,at least you got to have 75 of compression on each cylinder.

A/C Problem usuallyabout 200,000 miles (specifically high pressure hose leaks and compressor clutch usually within 30,000 miles of the hose going.)
At about 250,000 miles or so the main relay goes usually at about 290,000 Torque convertor in Automatic Transmission starts to slip.. Manual tranny can't say too much there depends on how you drive . replace clutches at every 50K or at 150K depends on driver.The cat and the mufflers usually go at abot 190,000 give or take (depends how much water you drove threw). Lastly fast idle cam valve about every 120,000. As you can see this is a great car to own.

sorry to tell you i dont think its a sensor. but i think the transmission will need a rebuild. write me a mesg and let me know how many miles it has on it and also smell the tranny fluid and see if it has a pundgent smell

I had a similar problem.
At a cold start the rpm would come up normally then slowly drop then stall out. Car would stall at lights and stop signs. My mechanic after having for 3 days found a faulty cam sensor.